Stu Galley is an American developer of interactive fiction who was an Implementor at Infocom. He also served as corporate clerk from incorporation in 1979 to merging with Activision in 1986. He wrote three of Infocom's original interactive fiction titles, The Witness (1983), Seastalker (with Jim Lawrence, 1984) and Moonmist (with Jim Lawrence, 1986). As a result he joined the Mystery Writers of America by invitation.
He started writing professionally as a reporter and then editor-in-chief of the campus newspaper at Caltech, where he was a student. His reporting included interviews with both Linus Pauling and Richard Feynman at the times that they won Nobel prizes. He became a member of the honor societies Alpha Phi Gamma and Tau Beta Pi.